US3222161A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum treated high silicon cast iron and process for making same
Assignee: Flowserve Corp
•
Filing: 1963-06-10
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Granted: 1965-12-07
•
Expires: 1983-06-10
Abstract
No abstract record available.
Inventors
- 👤 Walter A Luce
- 👤 Glenn W Jackson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:04
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/10; C21C1/00; C21C1/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
77 words
THE METHOD OF IMPROVING THE MECHANICAL PROPERTIES OF HIGH SILICON CAST IRON CONTAINING AT LEAST ABOUT 12% SILICON, 1% CARBON, THE BALANCE SUBSTANTIALLY ALL IRON TO OBTAIN A MINIMUM TRANSVERSE LOAD STRENGTH OF 1600 POUNDS IN THE AS-CAST METAL, WHICH COMPRISES THE STEPS OF SUBJECTING THE MOLTEN CAST IRON TO VACUUM TO REDUCE THE GAS CONTENT THEREOF TO NOT OVER ABOUT 2 P.P.M. OF HYDROGEN, 6 P.P.M. NITROGEN AND 20$10P.P.M. OF OXYGEN, AND IMMEDIATELY CASTING THE METAL.
Claim 2
Independent Claim
77 words
THE METHOD OF IMPROVING THE MECHANICAL PROPERTIES OF HIGH SILICON CAST IRON CONTAINING AT LEAST ABOUT 12% SILICON, 1% CARBON, THE BALANCE SUBSTANTIALLY ALL IRON TO OBTAIN A MINIMUM TRANSVERSE LOAD STRENGTH OF 1600 POUNDS IN THE AS-CAST METAL, WHICH COMPRISES THE STEPS OF SUBJECTING THE MOLTEN CAST IRON TO VACUUM TO REDUCE THE GAS CONTENT THEREOF TO NOT OVER ABOUT 2 P.P.M. OF HYDROGEN, 6 P.P.M. NITROGEN AND 20$10P.P.M. OF OXYGEN, AND IMMEDIATELY CASTING THE METAL.
Claim 3
Dependent Claim
75 words
HIGH SILICON CAST IRON HAVING A SILICON CONTENT OF AT LEAST 12%, CARBON OF ABOUT 1%, THE BALANCE BEING SUBSTANTIALLY ALL IRON; SAID ALLOY AS CAST HAVING NOT OVER ABOUT 2 P.P.M. OF HYDROGEN, 6 P.P.M. OF NITROGEN, 20$10 P.P.M. OF OXYGEN; SAID ALLOY FURTHER HAVING A MINIMUM TRANSVERSE LOAD STRENGTH OF AT LEAST 1300 POUNDS AND CHARACTERIZED BY A MICROSTRUCTURE OF FINE ACICULAR GRAPHITE UNIFORMLY DISTRUBUTED IN A FINE GRAIN DENDRITIC IRON SLILICID MATRIX.
Claim 4
Dependent Claim
75 words
HIGH SILICON CAST IRON HAVING A SILICON CONTENT OF AT LEAST 12%, CARBON OF ABOUT 1%, THE BALANCE BEING SUBSTANTIALLY ALL IRON; SAID ALLOY AS CAST HAVING NOT OVER ABOUT 2 P.P.M. OF HYDROGEN, 6 P.P.M. OF NITROGEN, 20$10 P.P.M. OF OXYGEN; SAID ALLOY FURTHER HAVING A MINIMUM TRANSVERSE LOAD STRENGTH OF AT LEAST 1300 POUNDS AND CHARACTERIZED BY A MICROSTRUCTURE OF FINE ACICULAR GRAPHITE UNIFORMLY DISTRUBUTED IN A FINE GRAIN DENDRITIC IRON SLILICID MATRIX.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-06 | 1969-06-07 | 1969-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-06 | 1973-06-07 | 1973-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-06 | 1977-06-07 | 1977-12-07 | $7700.00 | Window Closed / Lapsed |